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Investment Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Amortized Cost |  |  |
Total | $ 0 |  |
Fair Value |  |  |
Fair Value | 3,498,087,000 |  |
Amortized Cost |  |  |
Due in one year or less | 7,308,000 |  |
Due after one year through five years | 57,855,000 |  |
Due after five years through ten years | 531,275,000 |  |
Due after ten years | 2,901,649,000 |  |
Amortized Cost | 3,498,087,000 | $ 1,940,763,000 | $ 1,789,509,000
Fair Value |  |  |
Due in one year or less | 7,339,000 |  |
Due after one year through five years | 59,731,000 |  |
Due after five years through ten years | 547,293,000 |  |
Due after ten years | 2,947,566,000 |  |
Fair Value | $ 3,561,929,000 | $ 1,956,047,000 | $ 1,813,134,000

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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